1. Temperature Dependence of the Superconducting Order Parameter in Stoichiometric Alkali Metal-Based Pnictide EuCsFe4As4.
- Author
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Kuzmicheva, Tatiana, Pervakov, Kirill, Vlasenko, Vladimir, Degtyarenko, Alena, and Kuzmichev, Svetoslav
- Subjects
ANDREEV reflection ,REFLECTANCE spectroscopy ,ANTIFERROMAGNETIC materials ,ALKALI metals ,SINGLE crystals ,SUPERCONDUCTIVITY ,METALLIC films - Abstract
We present the study of the superconducting order parameter in single crystals of alkali metal EuCsFe 4 As 4 pnictide belonging to the novel 1144 family, turning to the superconducting state in the stoichiometric composition at critical temperature T c ≈ 37 K, and showing an antiferromagnetic ordering below T c . In the superconducting state, using incoherent multiple Andreev reflection effect spectroscopy of superconductor-thin normal metal-superconductor (SnS) junctions, we show a multiple-gap superconductivity with possibly anisotropic large SC gap with an extended s-wave symmetry, and isotropic small SC gap. We directly determined the magnitudes, characteristic ratios, and temperature evolution of the superconducting gaps. The latter are found to be typical for a superconductor with rather weak interband interaction between SC condensates in the k-space. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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